Kay OwensThe argument in this paper is that identity as a mathematical thinker develops through self-directed learning within a supportive community of practice. This paper discusses how identity as a mathematical problem solver and investigator develops through selfregulation. This development is illustrated by considering students undertaking a mathematics and technology subject in a primary teacher education degree. It shows how students set goals, plan, organise, self-evaluate, record keep and structure their learning environment to achieve self-regulation. The role of the tutorial group and technology is also important in establishing their identity as a mathematical problem solver and investigator.